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what i am not clear is that my tablespaces are local extent management and of uniform extent size is 1m, so why my query of max(bytes) is giving the the maximum extent size is near- free space available in the tablespace. My interpretation is that if the segment need extra space the next available contiguous blocks on disk is allocated as an extent and is available to the segments which is in 1MB(default). So please correct me if I am wrong and help me to understand the results in the above query thanks a lot in advance for your help.